Yes and I live in Arizona and mailed in my ballot for the 2016 election. The point is not that it is possible to do some mail in voting. The point is that it isn't ridiculous to think that mail in voting could be succeptible to fraud. Certainly not so much so that twitter should be trying to influence an election in this way.

Except that we have several years of experience with mail-in voting in states like Oregon, Washington and others. No one has ever uncovered any impactful voter fraud.

Paper-based voting like this is very hard to hack or commit fraud on a scale that is large enough to have an effect. If you were to fill out your aunt’s ballot, as someone suggested, it would have a nearly unmeasurable effect.

There are lot of interesting rules about such ballots. For example, some states do not count them at all unless the margin of victory is less than the number of eligible or returned absentee ballots.

That...doesn't seem to connect in any way with the question? Are we just free associating now?

You may be thinking of provisional ballots.